Question

PLEASE HELP. Evaluate the series

Answer 1

you could plug in the integers from n=3 to n=8 (inclusive)
and add the terms

Answer 2

f(n)=5n
f(3)=?
f(4)=?
f(5)=?
f(6)=?
f(7)=?
f(8)=?
then add those results

Answer 3

So wait id just add them normally?

Answer 4

Or you can put the summation as
5 times the sum of 3 to 8

Answer 5

38?

Answer 6

thats what igot

Answer 7

yes...I think...what does normally mean? Do you do it non-normally sometimes :p


this isn't the only way to do this problem
there are formulas you could use but you have to be clever since the bottom limit is n=3 and not n=1

Answer 8

like 5+5=10

Answer 9

Just sum 3+4+5+6+7+8 and multiply by 5

Answer 10

ahhhhh
ok

Answer 11

how did you get 38

Answer 12

65?

Answer 13

I just didnt multiply the 5 before

Answer 14

\[f(n)=5n \\ f(3)=5(3) \\ f(4)=5(4) \\ f(5)=5(5) \\ f(6)=5(6) \\ f(7)=5(7) \\ f(8)=5(8) \\ \text{ adding lines 2 through 6 } \\ \text{ should give you a number over 100 }\]

Answer 15

You mean 165?

Answer 16

how though?

Answer 17

Just sum 3+4+5+6+7+8 and multiply by 5

Answer 18

Thats what you said

Answer 19

Sum 3+4+5+6+7+8=33 then 33*5=??

Answer 20

yeah idk i probably messed up something on my calculator, im sleepy

Answer 21

but thank you

Answer 22

Ok no problem

Answer 23

help with one more?

Answer 24

Hmm ok

Answer 25

@isaidavila